With another year behind us, it's time to reflect on business successes and stumbles in 2012, and set goals for 2013. As entrepreneurs and small-business owners, we sometimes need a little motivation to help inspire us to keep moving forward.

There were many inspiring moments in the world of sports last year -- from the San Francisco Giants winning in the World Series to the triumphs during the 2012 London Olympics.

Many of the teams and athletes that came out on top had to fight adversity before they found success, picking themselves up after loses and learning from their mistakes. Much is the same in business.

With that in mind, here are five quotes from sports in 2012 that can help provide inspiration heading into 2013:

1. Tennis star Serena Williams on resilience. After coming back from a life-threatening illness Williams went on to win Wimbledon, Olympic and U.S. Open titles in 2012, and had this to say:

"I really think a champion is defined not by their wins but by how they can recover when they fall. I have fallen several times. Each time I just get up and I dust myself off and I pray and I'm able to do better."

Lesson: Business owners consistently face adversity of some kind or another. How you react in these times can define whether you succeed or fail at achieving your goals.

2. Baseball manager Bruce Bochy on teamwork. After the San Francisco Giants swept the Detroit Tigers 4-0 to win the World Series in October, Bochy was astounded:

"It's amazing what a group of guys who play like a team can accomplish. I'm numb that we have won two World Series in the last three years."

Lesson: As an entrepreneur, it's critical to surround yourself with people who are driven and committed to accomplish your company goals together rather than focusing on their own individual goals. As they say in sports, there is no "i" in team.

5. New York Giants quarterback Eli Manning on success. After winning his second Super Bowl, one more than his older brother Peyton, Manning wasn't boastful:

"This isn't about bragging rights. This is a lot bigger. This is about a team, an organization being named world champions."

Lesson: When you achieve success in business in 2013, approach it with humility. After all, even if you operate as an independent entrepreneur, it's likely that someone has helped you along the way. Recognize those people and make sure they share in your success.